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UNITED STATES PATENT OFFICE.

SAMUEL M. ROAGH, OF SAVANNAH, GEORGIA.

ARTIFICIAL TOOTH-CROWN.

SPECIFICATION forming part of Letters Patent No. 288,492, dated November 13, 1883.

Application filed January 20, 1883. (No model) To all whom it may concern Be it known that I, SAMUEL M. ROACH, of Savannah, in the county of Ghatham, in the State of Georgia, have invented certain new and useful Improvements in Artificial Tooth- Crowns and the Method of Mounting the Same on Natural Roots, of which the following is a specification.

My invention is directed to artificial toothcrowns which are intended to be mounted on natural roots; and it is my object to so make the crown that it may be applied and mounted more conveniently and expediently than attainable under existing methods, and also that it may be held in place permanently and with entire firmness.

The nature of my invention can best be eX- plained and understood by reference to the accompanying drawings, in which Figure l is a perspective view of a toothcrown madein accordance with my invention.

Fig. 2 is a longitudinal central section of the same. Fig. 3 is a like section through the tooth-crown and root to which the same is fitted.

In the various figures the parts are represented on, an enlarged scale.

The crown A is intended to be held to the root B by a pin or post, which is embedded at the one end in the amalgam filling of the root and at the other end in the amalgam filling of the crown, and it therefore has, in common with other teeth-crowns of the same class, a

longitudinal cavity or passage, a, to receive the pin and amalgam filling. In other respects, however, it differs from crowns here tofore used. In the first place, it is designed for a headed pin, whose head shall engage it directly instead of through the intermediary of the amalgam; and to this end it is provided in the front wall of the cavity a, at the point where the head of the pin will come, with a notch or recess, 1), into which the flanged top or head of the pin will project when the crown is in place. The pin lies up against the front wall, a, of the cavity a, with its head projecting into and engaging the recess b, as indicated in Fig. 3, where the pin is lettered d and its head is lettered e. The tooth-crown is thus directly engaged and supported by the pin or post, and by this means, when the filling is in place, is most effectively steadied and strongly held in place. In the next place, the longitudinal cavity a is open at the rear throughout its length, as indicated at f, so that after the pin is in place in the crown the amalgam filling, lettered y, can be put in and worked through the rear side of the cavity instead of through its ends. By this means the operator is enabled to perform the requisite work very conveniently and expeditiously and entirely effectively.

The amalgam filling of the root in which the pin is embedded is lettered h.

The invention is adapted for what are known as front teeth, and not for molars.

What I claim, and desire to secure by Letters Patent, is as follows:

1. A11 artificial tooth-crown formed with a longitudinal amalgamand pin-receiving passage or cavity open to the rear throughout its length, and provided in its front wall with a notch or recess which opens to the rear, and is provided at the end nearest the root or base with a shoulder, over which the head of the binding post or pin can take, whereby the two may be secured together without the use of rivets, substantially as and for the purposes before set forth.

2. The tooth formed with longitudinal passage or cavity a, open at the rear throughout its length, and provided with front wall with a shouldered notch or recess, b, in combination with the headed or flanged pin or post (Z, the head of which takes over the shoulder of said notch, and the filling g, substantially as hereinbefore set forth.

In testimony whereof I have hereunto set my hand this 12th day of January, 1883.

SAML. M. ROACH.

' WVitnesses: WM. W. SUFBURROA,

H. F. MOLINA. 

